The fact that Yuuko took Sakura's memories of C!Syaoran lead me to believe that Sakura/R!Syaoran has a chance of happening.

Sakura's current feelings for the clone are only based on the time they spent together on the journey; I think it's natural for someone with no memories and who fell asleep all the time to fall for the person protecting them. Given time I think she could develop feelings for the real one, especially if she realizes that the heart that the clone had is now with the real one and that it was always R!Syaoran's heart.